Synthesis and properties of polycharge phases in the system La-Li-M-Co-O (M=Ca, Sr, Ba)
Samples of La1-3xLixM2xCoO3-δ (M = Ca, Sr, Ba; 0≤x≤0,1) were synthesized by co-precipitation method. It is shown that the region of their homogeneity lies in the range of substitutions 0≤ x ≤0.05. The volume of the unit cell increases with the size of the alkaline earth metal that replaces lanthan...
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| Format: | Article |
| Language: | English |
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Vasyl Stefanyk Precarpathian National University
2022-08-01
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| Series: | Фізика і хімія твердого тіла |
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| Online Access: | https://journals.pnu.edu.ua/index.php/pcss/article/view/5772 |
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| author | Olexandr Dziazko Sergiy Nedilko Olexandr Zaslavsky Vadym Kulichenko Igor Fesych Anastasiia Bolotnikova Nataliia Sabadash |
| author_facet | Olexandr Dziazko Sergiy Nedilko Olexandr Zaslavsky Vadym Kulichenko Igor Fesych Anastasiia Bolotnikova Nataliia Sabadash |
| author_sort | Olexandr Dziazko |
| collection | DOAJ |
| description | Samples of La1-3xLixM2xCoO3-δ (M = Ca, Sr, Ba; 0≤x≤0,1) were synthesized by co-precipitation method. It is shown that the region of their homogeneity lies in the range of substitutions 0≤ x ≤0.05. The volume of the unit cell increases with the size of the alkaline earth metal that replaces lanthanum. Surface morphology of the obtained mixed oxides was studied by SEM. In all samples (except strontium - containing) paramagnetic Co2+ ions from the impurity Co3O4, which are in different local environments and have different degrees of exchange interaction with each other, are contained in the form of chain fragments -Co2+-O2--Co2+-O2--Co2+-O2— and contain defective centers Со2+, which are formed during the desorption of lattice oxygen from the surface, or in the process of diffusion of oxygen from the volume of material to the surface. In strontium-containing samples La0,85Lix0,05Sr0,01CoO3-δ there are mainly ferromagnetic clusters Co3+-Co4+. |
| first_indexed | 2024-04-11T04:53:22Z |
| format | Article |
| id | doaj.art-75f682c51c214be78e379e6fbffdab97 |
| institution | Directory Open Access Journal |
| issn | 1729-4428 2309-8589 |
| language | English |
| last_indexed | 2024-04-11T04:53:22Z |
| publishDate | 2022-08-01 |
| publisher | Vasyl Stefanyk Precarpathian National University |
| record_format | Article |
| series | Фізика і хімія твердого тіла |
| spelling | doaj.art-75f682c51c214be78e379e6fbffdab972022-12-26T23:53:16ZengVasyl Stefanyk Precarpathian National UniversityФізика і хімія твердого тіла1729-44282309-85892022-08-0123343544210.15330/pcss.23.3.435-4425772Synthesis and properties of polycharge phases in the system La-Li-M-Co-O (M=Ca, Sr, Ba)Olexandr Dziazko0Sergiy Nedilko1Olexandr Zaslavsky2Vadym Kulichenko3Igor Fesych4Anastasiia Bolotnikova5Nataliia Sabadash6Taras Shevchenko National University of Kyiv, Kyiv, UkraineTaras Shevchenko National University of Kyiv, Kyiv, UkraineUkrainian State Scientific Research Institute "Resurs", Kyiv, UkraineKyiv National University of Construction and Architecture, Kyiv, UkraineTaras Shevchenko National University of Kyiv, Kyiv, UkraineBogomolets National Medical University of Kyiv, Kyiv, UkraineFood Technologies National University of Food Technologies, Kyiv, UkraineSamples of La1-3xLixM2xCoO3-δ (M = Ca, Sr, Ba; 0≤x≤0,1) were synthesized by co-precipitation method. It is shown that the region of their homogeneity lies in the range of substitutions 0≤ x ≤0.05. The volume of the unit cell increases with the size of the alkaline earth metal that replaces lanthanum. Surface morphology of the obtained mixed oxides was studied by SEM. In all samples (except strontium - containing) paramagnetic Co2+ ions from the impurity Co3O4, which are in different local environments and have different degrees of exchange interaction with each other, are contained in the form of chain fragments -Co2+-O2--Co2+-O2--Co2+-O2— and contain defective centers Со2+, which are formed during the desorption of lattice oxygen from the surface, or in the process of diffusion of oxygen from the volume of material to the surface. In strontium-containing samples La0,85Lix0,05Sr0,01CoO3-δ there are mainly ferromagnetic clusters Co3+-Co4+.https://journals.pnu.edu.ua/index.php/pcss/article/view/5772lacoo3mixed oxideslanthanum cobaltatesperovskite-like structuresurface morphologyfmrdiffuse reflection spectracluster spin glass |
| spellingShingle | Olexandr Dziazko Sergiy Nedilko Olexandr Zaslavsky Vadym Kulichenko Igor Fesych Anastasiia Bolotnikova Nataliia Sabadash Synthesis and properties of polycharge phases in the system La-Li-M-Co-O (M=Ca, Sr, Ba) Фізика і хімія твердого тіла lacoo3 mixed oxides lanthanum cobaltates perovskite-like structure surface morphology fmr diffuse reflection spectra cluster spin glass |
| title | Synthesis and properties of polycharge phases in the system La-Li-M-Co-O (M=Ca, Sr, Ba) |
| title_full | Synthesis and properties of polycharge phases in the system La-Li-M-Co-O (M=Ca, Sr, Ba) |
| title_fullStr | Synthesis and properties of polycharge phases in the system La-Li-M-Co-O (M=Ca, Sr, Ba) |
| title_full_unstemmed | Synthesis and properties of polycharge phases in the system La-Li-M-Co-O (M=Ca, Sr, Ba) |
| title_short | Synthesis and properties of polycharge phases in the system La-Li-M-Co-O (M=Ca, Sr, Ba) |
| title_sort | synthesis and properties of polycharge phases in the system la li m co o m ca sr ba |
| topic | lacoo3 mixed oxides lanthanum cobaltates perovskite-like structure surface morphology fmr diffuse reflection spectra cluster spin glass |
| url | https://journals.pnu.edu.ua/index.php/pcss/article/view/5772 |
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